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Glossary » MUD

MUD

multi-user dimension (or dungeon), a virtual reality, usually text-based, populated by many people, often used for chatting or playing games with other users.

Variations include a MOO (object-oriented MUD), MUCK (multi-user chat kingdom), and MUSH (multi-user shared hallucination). While some people make careful distinctions, the terms are used fairly interchangeably.